Veggies and fruits are very nutritious and are very portable. What I suggest is going to the store and buying some useful tupperware. Make sure you get one for each meal of the day, plus one for a snack. Make a goal for yourself to fill all four up each morning. Or you could even prepare 3–4 days in advance.
For bkfast you could throw in some yogurt and fruit. Or a bagel and cream cheese.
For lunch you could throw in a quick sandwich, salad, or microwavable soup.
For dinner you could do the same as lunch or you could do a pasta or casserole that’ll last 3–4 days.
For snack I’d try fruits and veggies.
It is also absolutely essential to carry around a full water bottle.
You could also carry around some trail mix with you. It is quite nutritious and easy to eat on-the-go.
I don’t know if by Uni you mean a college/university but if that is the case you should know that you will absolutely need to change your eating habits if you want to keep good grades. Otherwise keep in mind that there is a lot of fat in the brain and your body will use it if it needs to, which will deplete your resources for studying.
I agree that this is a very unhealthy habit that is developing. Your mind will suffer and so will your body from this habit. It sounds like you may be developing a form of anorexia and not be aware of it. Sometimes when a label is put on top of what you are doing it helps you realize how scary it is, otherwise I detest labeling. In the long run this will be very unhealthy for you and you will find that you are unable to deal with stress well, one major side effect of not eating enough. I think it is very important that you sit down, write out your schedule, and find a way to rearrange it not only so you have time to eat but also so you have time to relax as well. Balance is necessary. Please don’t have the mindset that balance will come later, it is important for you now. If none of this helps I would suggest seeing a counselor, most schools have them free for students. I think it is that serious of an issue.